CN101517165A - Floating system connected to an underwater line structure and methods of use - Google Patents
Floating system connected to an underwater line structure and methods of use Download PDFInfo
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- CN101517165A CN101517165A CNA2007800350662A CN200780035066A CN101517165A CN 101517165 A CN101517165 A CN 101517165A CN A2007800350662 A CNA2007800350662 A CN A2007800350662A CN 200780035066 A CN200780035066 A CN 200780035066A CN 101517165 A CN101517165 A CN 101517165A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000010276 construction Methods 0.000 claims description 22
- 238000004873 anchoring Methods 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 239000003643 water by type Substances 0.000 claims 1
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- 206010016256 fatigue Diseases 0.000 description 10
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- 229930195733 hydrocarbon Natural products 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
- B63B27/24—Arrangement of ship-based loading or unloading equipment for cargo or passengers of pipe-lines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
- E21B17/015—Non-vertical risers, e.g. articulated or catenary-type
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Abstract
There is disclosed a floating system positioned in a body of water having a water bottom, the system comprising a host member floating in the water; an elongated underwater line structure, comprising a top connected to the host; a bottom extending to the seabed and adapted to connect to a flowline lying on the seabed; a first portion of the line structure being shaped concave upward; a second portion of the line structure being shaped concave upward; and a transition segment between being shaped concave downward, the transition segment located between the first portion and the second portion.
Description
Technical field
The present invention relates to a kind ofly extend to the underwater line structure (for example marine riser) in seabed, and relate to a kind of method of making and using this system from the main frame (host) that is positioned at seawater surface.
Background technology
The some kinds of structures that floating structure and submerged pipeline are coupled together have been proposed.Employed structure depends on particularly relevant with vertical motion with the level of the depth of water and floating structure parameter usually, considers these parameters so that select suitable structure and/or connection type.
A kind of structure of frequent use is called as free suspended structure.In this structure, marine riser freely is suspended on the main frame at its top, and has formed downward arcuate shape, touches seabed (touchdown point) up to it.After touchdown point,, pipe is connected to undersea device thereby flatly resting the seabed.In this structure, regardless of the type of employed marine riser, the vibration of main frame can cause the vibration of the bending curvature of the pipeline that is positioned at marine riser bottom (zone of particularly contacting to earth).This host oscillation can cause near the remarkable fatigue damage the marine riser touchdown point.
In free suspended structure, when marine riser comprised rigid pipe or comprise two concentric rigid pipes, it can be called as steel catenary riser or SCR; It is bigger can not cause stress to surpass the radius of curvature of sweep of yield strength of the metal material of making SCR, be about 100m or more than.
In free suspended structure, can in the deep-sea, use flexible pipe.It is compared the advantage that can have and is with SCR: for example, the sweep that has a common boundary with the seabed has less radius of curvature.And because improved fatigue property, the main frame that this flexible pipe can allow to be positioned at the water surface has bigger vertical and horizontal movement.But its shortcoming that may have is very heavy, compare with SCR to have relatively poor thermal insulation, and the cost of per unit length is higher than SCR.
Combination construction can use marine riser, and its middle and lower part comprises steel marine riser vertical, rigidity, and top comprises short flexible pipe (jumper pipe).The weight of this marine riser can be by the buoyant device adjustment that is positioned on the vertical rigid element, and the motion of main frame can be compensated by the short flexible pipe of length.
U.S. Patent application No.2005/0063788 discloses a kind of hybrid riser, it has lower section and upper segment, described upper segment comprises flexible pipe, described lower section comprise be communicated with flexible pipe, the VERTICAL TUBE of rigidity substantially, described marine riser also comprises upper end region place that is arranged in described rigid pipe or the buoyancy section that is positioned at the upper end region of described rigid pipe.Described buoyancy section also comprises elongated cylindrical buoyancy element, it can be have valve, the coaxial spaced tubular-shaped structures so that it can controllably be full of or emptying.This hybrid riser directly anchors in the seafloor foundation that is positioned at its bottom.This hybrid riser can be built on land, and is arrived near the connected facility by towage.At this full content of incorporating U.S. Patent application No.2005/0063788 into for referencial use.
This area needs a kind of SCR structure that can not stand too early fatigue failure owing to the caused touchdown point motion of the motion of floating main frame.This area marine riser that also need make, that do not comprise flexible portion by single rigid material.This area also needs marine riser cheaply.
Summary of the invention
In one aspect, the invention provides a kind of floating system that has in the water-bed water body that is positioned at, this system comprises: swim in the host part in the water; The elongated underwater line structure that comprises the top that is connected to main frame; Extend to the seabed and be suitable for being connected to the bottom that rests the flow line on the seabed; The first of presenting spill of line construction; The second portion of presenting spill of line construction; And being the changeover portion of spill down, described changeover portion is between first and second portion.
On the other hand, the invention provides a kind of method of improving floating system, this system comprises the main frame that swims in the water body with bottom; Elongated underwater structures, this underwater structures has first end, the second end and the main body between first end and the second end, wherein first end is connected to main frame, main body extends through water body, and the second end is positioned near the bottom, and this method comprises: promote the changeover portion of main body at hoist point, thereby be enough to make at first depth of water place changeover portion of main body to form concave shape, make the part of main body form concave shape at second depth of water place, wherein second depth of water is darker than first depth of water.In certain embodiments, this method comprises that also the changeover portion with main body anchors to the bottom.
Advantage of the present invention can comprise one or more in following:
A kind of SCR structure that can premature fatigue is damaged owing to the motion of the caused touchdown point of the action of main frame is provided;
Marine riser of being made by single rigid material or the marine riser of almost being made by single rigid material are provided;
The marine riser that provides major part to make by rigid material;
The marine riser that can not comprise flexible portion is provided; And
Marine riser cheaply is provided.
Description of drawings
Fig. 1 is the schematic diagram of prior art system, this system comprises the floating main frame 103 that is positioned at the water surface 121, wherein tubular member 105 extends from this floating main frame, this tubular member 105 has from floating main frame 103 and extends through the marine riser part 105A of water body 125 to touchdown point 124 downwards, and tubular member 105 has the pipeline part 105D that coastal bed 120 extends.
Fig. 2 is the schematic diagram of one embodiment of the present of invention, wherein shown the floating main frame 103 that is positioned at the water surface 121, wherein tubular member 105 extends from this floating main frame, and it is promoted by buoyancy member 108 by connector 131, and is anchored into basis 111 by connector 132.
Fig. 3 is the diagram of another embodiment of the present invention, has shown that buoyancy member 108 directly is attached to buoyancy structure 105 under water, and has not used connector component.
Fig. 4 is the diagram of another embodiment of the present invention, has shown that buoyancy member 108 is connected to underwater structures along lifting zone 105F at a plurality of somes place, also shows a plurality of anchoring members 111.Transition between two catenary structures can become level and smooth.
Fig. 5 is the diagram of another embodiment of the present invention, has shown that a plurality of buoyancy members 108 are connected to a plurality of points along lifting zone 105F.
Fig. 6 is the diagram of carrying out board design in example.
Fig. 7 shows the simulation fatigue results of prior art systems shown in Figure 1, consequently corresponds respectively to " DOE-B " and " API-X " of 26.5 and 2.7 years.
Fig. 8 shows the simulation fatigue results of system shown in Figure 6, and its result corresponds respectively to " DOE-B " and " API-X " of 3470 and 214 years.
The specific embodiment
In one embodiment, disclose a kind of floating system that has in the water-bed water body that is positioned at, this system comprises: swim in the host part in the water; The elongated underwater line structure that comprises the top that is connected to main frame; Extend to the seabed and be suitable for being connected to the bottom that rests the flow line on the seabed; The first of presenting spill of line construction; The second portion of presenting spill of line construction; And being the changeover portion of spill down, described changeover portion is between first and second portion.In certain embodiments, elongated underwater structure comprises steel catenary riser.In certain embodiments, this system also comprises the buoyancy member that is connected to changeover portion.In certain embodiments, this system also comprises the anchoring members that is connected to changeover portion.In certain embodiments, this system also comprises by a plurality of connectors and is connected at least one buoyancy member in changeover portion, first and the second portion.In certain embodiments, this system also comprises by a plurality of connectors and is connected at least one a plurality of buoyancy members in changeover portion, first and the second portion.In certain embodiments, this system also comprises by a plurality of connectors and is connected at least one anchoring members in changeover portion, first and the second portion.In certain embodiments, this system also comprises by a plurality of connectors and is connected at least one a plurality of anchoring members in changeover portion, first and the second portion.In certain embodiments, this system also comprises the buoyancy member of installing around changeover portion.In certain embodiments, the minimum point of first is hanged down 5 to 50 meters than the peak of changeover portion.In certain embodiments, changeover portion comprises at least one in prebuckling stay pipe (shore pipe), bell-mount, crooked limited part, tapered stress joints, titanium stress joint, flexible hose and the deep-water flexible joint.
In one embodiment, disclose a kind of method of improving floating system, this system comprises: swim in the main frame that has in the water-bed water body; Elongated underwater structures, this underwater structures has first end, the second end and the main body between first end and the second end, wherein first end is connected to main frame, main body extends through water body, and the second end is positioned near the bottom, this method comprises: the changeover portion that promotes main body at the hoist point place, thereby be enough to make the changeover portion of main body form concave shape at first depth of water place, make the part of main body form concave shape at second depth of water place, wherein second depth of water is darker than first depth of water.In certain embodiments, this method comprises that also the changeover portion with main body anchors to the bottom.In certain embodiments, promote changeover portion and comprise changeover portion is promoted about 10 to 200 meters from the bottom, for example promote about 25 to about 100 meters, or about 50 meters.In certain embodiments, elongated underwater structures comprises steel catenary riser.In certain embodiments, second depth of water is than first depth of water dark 5 to 50 meters.
Before discussing the present invention, earlier with reference to prior art.At first with reference to Fig. 1, it is the schematic diagram that shows prior art systems, and wherein floating main frame 103 is positioned at the water surface 121, and tubular member 105 extends from this floating main frame.Tubular member 105 has marine riser part 105A, and this marine riser part 105A extends through water body 125 and crossing with seabed 120 at touchdown point 124 downwards from floating main frame 103.Tubular member 105 also has the pipeline part 105D that extends at the coastal end 120.
As discussing in above background technology part, the wave action that acts on the floating main frame 103 is shifted energy by tubular member 105, this may cause tubular member 105 that fatigue damage for example takes place near touchdown point, and this touchdown point slides along marine riser along with the motion of main frame.
One embodiment of the present of invention comprise one or more remodeling to conventional steel catenary riser.Between the riser top and touchdown point that hang on the main frame, can be raised by buoyancy member (for example air tank or buoyant foam spare) along (or a plurality of) position of marine riser, and be anchored into basis on the seabed in the seabed.The top that is connected to main frame and be raised and the position of grappling between marine riser formed first catenary construction, usually, but be not absolute, the summit of catenary construction is lower than buoyance lift and anchor point.Second catenary construction that contacts with the seabed is positioned under buoyance lift and the anchor point.The pipeline that is laid on the seabed is positioned at outside the touchdown point.Near buoyance lift and anchor point, pipeline section can be bent to form transition between two catenary constructions.For fear of too small bending curvature and therefore produce than macrobending stress, transitional pipe segment can limit its bending by for example tapered stress joints or crooked limited part, or can be made to limit its bending by the compliant member of allowing little bending curvature.
In certain embodiments, the moment of flexure of marine riser is controlled.For traditional SCR, host motion causes that mainly near the moment of flexure the touchdown point changes.Because touchdown point along the marine riser certain-length that moves, therefore is difficult in along the length of movable touchdown point scope and reinforces marine riser under the effect of host offset and current.In certain embodiments, touchdown point can be by buoyance lift and grappling and with the motion isolation of main frame, principal curvature curvature and change and can concentrate on buoyance lift and anchor station.So, can control the moment of flexure level along the fixing some place of marine riser with comparalive ease.Near local moment of flexure buoyance lift and the anchor point (changeover portion) reduce and to realize by two kinds of mechanism.A kind of is that another kind is to use compliant member to allow big local buckling curvature by the crooked limit flexion curvature on the long length that is distributed to that will localize.
In certain embodiments, a kind of riser system is provided, this riser system is used for carrying liquid and/or gas from miscellaneous equipment to water surface Floating Production main frame by the flow line that rests on the seabed, or by the seabed flow line from main frame to miscellaneous equipment output liquid and/or gas.Riser top can be connected to main frame, and at certain place a bit along marine riser, marine riser can be by buoyancy member by buoyance lift and be anchored into seafloor foundation.Buoyance lift and anchor point are with the marine riser separated into two parts, and each part has different catenary constructions.In certain embodiments, marine riser is anchored by buoyance lift and some place in the buoyance lift section along the buoyant module of a water proof pipeline section of lacking by certain-length.In certain embodiments, buoyancy member promotes marine riser by a plurality of connectors and is anchored by a plurality of anchoring members.A plurality of buoyancy connectors and grappling connector help to form seamlessly transitting of these two catenary constructions.The grappling number of connecting pieces can equate that with the number of connecting pieces that is used for buoyancy member their quantity depends on the parameter of marine riser.In certain embodiments, this system comprises a plurality of buoyancy members and a plurality of grappling connector, and it can allow the transition of catenary construction to become more level and smooth.
In certain embodiments, the invention provides a kind of moment of flexure level at buoyance lift and anchor point place and method of variation thereof of reducing.For the transition of two different catenary constructions, this changeover portion can stand significant bending.Although separate with touchdown point, the vibration of main frame can be passed to buoyance lift and anchor point.Except a plurality of buoyancy and anchoring members, near the pipeline buoyance lift and the anchor point also can be designed to make up limit flexion or allow bending by a kind of in the following manner or its:
(1) near the tapered stress joints buoyance lift and the anchor point is used to reduce the flexural stress level;
(2) bell-mount or other bending restrictor are used near the bending curvature buoyance lift and the anchor point is limited in the upper limit of expectation;
(3) near the titanium stress joint buoyance lift and the anchor point, it has more the flexibility that is suitable for bending curvature than steel pipe;
(4) near a bit of jumper pipe buoyance lift and the anchor point is used to accept big bending curvature;
(5) be positioned at the deep-water flexible joint at buoyance lift and anchor point place, to allow bending; And/or
(6) near buoyance lift and anchor point, a bit of marine riser can be had the average bending curvature of very little flexural stress by prebuckling with formation.
The details that moment of flexure reduces method depends on riser parameters and ambient conditions.
With reference to the accompanying drawings the present invention is further described.Referring now to Fig. 2, it has shown the floating main frame 103 that is positioned at the water surface 121, and wherein underwater structures 105 extends from this floating main frame.
It should be understood that floating structure 103 can be any kind floating structure with the line member of extending to the bottom, this line member will stand wave action by the response of 103 pairs of wave actions of floating structure.For example, at sea in hydrocarbon exploration, drilling well, production, processing or the transport field, the non-limiting example of floating structure 103 comprises steamer, canoe, barge, drilling rig, platform, FPSO (Floating Production, storage and uninstalling system), semisubmersible platform, FSRU (floating storage and regasification unit) or the like.
Although shown is to swim on the water surface 121, it should be understood that floating main frame 103 also floatability and still can stand wave action at the water surface below 121, it extends initial hundreds of feet usually under the water surface 121.Although shown is put off floating, it should be understood that also floating main frame 103 can be anchored into the land, perhaps bolt is tied to the land, or is partly supported by land (as dock, harbour etc.).
Elongated underwater line structure 105 can be as the structure of any kind known in the offshore technology, that extend from floating main frame 103.The most common is that underwater line structure 105 can be the tubular member of some types, is commonly referred to as " marine riser " in this area, its non-limiting example comprises umbilical cord, pipe, conduit, pipe, pipeline, but also can the tubular parts of right and wrong, for example hawser, pipeline, rope etc.
Underwater line structure 105 extends through water body 125 downwards from floating main frame 103, arrives seabed 120 at new touchdown point place, this new touchdown point usually than former touchdown point 124 (referring to Fig. 1) further from main frame 103, and the coastal ends 120 continue to extend.More specifically, underwater structures 105 extends through water body 125 downwards from floating main frame 103, and as traditional marine riser part 105A, underwater structures 105 is from upwards revolution and as marine riser part 105B of this local low point/region 105E to being positioned at the local low point/region 105E on the structure 105.
Buoyancy member 108 provides the lifting to underwater structures 105 at lift point/region 105F place, be subjected to being connected to the restriction of length of the anchor lines 132 on basis 111 in the rising of the hoist point 105F of lift point/region 105F place.This buoyancy makes a little/and regional 105E reduces and make a little/and regional 105F promotes, the slope of underwater structures 105 at point/regional 105F place is zero (0), and the slope of the slope of marine riser part 105A and marine riser part 105B has opposite symbol or polarity, simultaneously, the slope of marine riser part 105B and 105C has opposite symbol or polarity.The marine riser that is positioned at marine riser part on buoyance lift and the anchor point 105F and buoyance lift and is positioned under the anchor point 105F partly is two kinds of different catenary constructions, and near the marine riser of buoyance lift and anchor point 105F is the transition of these two catenary constructions.
Referring now to Fig. 3, in certain embodiments, buoyancy member 108 provides lifting to underwater structures 105 in the depth of water for the lift point/region 105F place of D1, and it is fully promoted so that be at depth of water D2 (D2 may be darker than D1 at this place) and form local low point/region 105E on the structure 105.This low point/region 105E is positioned on the structure 105 between lift point/region 105F and the floating main frame 103, and the depth of water of the comparable lift point/region 105F of the depth of water of this low point/region 105E is low.
Should be appreciated that from Fig. 2 underwater structures 105 comprises marine riser part 105A and 105B, it is at local low point/region 105E place fovea superior (away from seabed 120) and have low spot.Same, underwater structures 105 comprises marine riser part 105C and 105D, they also are the catenary constructions of fovea superior at touchdown point 105D place.So near formation recessed portion 105B and 105C (towards the seabed 120) is as the transition of these two catenary constructions.
Can use in the ship domain any in the known multiple buoyant material, for example foam or buoyancy can.Buoyancy member 108 can comprise that its density is suitable for providing the material of buoyancy, maybe can comprise the material with hole or hollow bulb that is used to provide buoyancy.
Buoyancy member 108 can provide enough buoyancy, so that not only be used for underwater structures 105 is risen to desired location on the seabed 120, but also the weight of any material of underwater structures 105 is passed in supporting.
As shown in Figure 2, buoyancy member 108 can be attached to underwater structures 105 by using one or more links 131, and link 131 can be rigidity or flexibility as required.This type of link 131 can be hawser, chain, rope, bar etc.
It should be understood that the mode that buoyancy member 108 is connected to underwater structures 105 is not crucial, and be a kind of decision design mode.
Referring again to Fig. 3, it shows that buoyancy member 108 directly is attached to underwater structures 105 and some embodiment of not using link 131 (see figure 2)s.Buoyancy member 108 can be enclosed within around the structure 105, or can be integrally formed with structure 105.
According to physical characteristic and other design parameters of underwater structures 105, possible is that the structure and/or the structure that provide lifting may cause some types at hoist point 105F place as shown in Figure 2 produce excessive stress.Alternatively, can provide lifting along a certain zone so that disperse to promote the stress of structure 105.For example, in certain embodiments, as shown in Figure 3, can provide lifting along lifting region 105F by using a plurality of buoyancy members 108 (perhaps big elongated buoyancy member 108).
In certain embodiments, in order to form lifting zone 105F, referring now to Fig. 4, it has shown that buoyancy member 108 is connected to underwater structures at a plurality of somes place along lifting zone 105F by a plurality of connectors 131.
In certain embodiments, in order to form lifting zone 105F, referring now to Fig. 5, it has shown that a plurality of buoyancy members 108 are connected to a plurality of points along lifting zone 105F.
Anchoring members 111 can be connected to underwater structures 105 by using connector 132, and this anchoring members 111 also is provided the position of stablizing underwater structures 105 in order to the buoyancy lifting that overcomes buoyancy member 108, and holds it in desired location.
Anchoring members 111 is known in offshore drilling well field, and any suitable anchoring members all can be used as anchoring members 111.Anchoring members 111 can rest seabed 120, and in this case, it has the lifting of suitable weight with opposing buoyancy member 108.Alternatively, anchoring members 111 can be attached to water-bed 120.
Shown in Fig. 2-5, anchoring members 111 can be attached to underwater structures 105 by using link 132, and these connectors can be rigidity or flexibility as required.This type of connector 132 can be hawser, chain, rope, bar etc.
In certain embodiments, can structure 105 be repeated to be connected to anchoring members 111 by using more than one link 132.
In certain embodiments, new riser member can be mounted by making it extend to water-bed 120 from main frame 103, and a part that promotes underwater structures 105 subsequently is away from the bottom 120, thereby formation recessed area 105F and fovea superior zone 105E (as shown in Figure 2).
In certain embodiments, new riser member can be installed by following manner: at first provide buoyancy member 108 for it; Make it extend to water-bed 120 subsequently from main frame 103; And allow it to form underwater structures 105 (as shown in Figure 2) with recessed area 105F and fovea superior zone 105E.
In certain embodiments, near the water proof pipeline section buoyance lift and the anchor point 105F can be the union of one section prebuckling.By the union of this prebuckling, the transition between two different catenary constructions may not can produce big moment of flexure.
In certain embodiments, be a plurality of tapered steel joints at point/regional 105F place by the pipeline section of buoyance lift and grappling, it causes tired maximum stress and stress oscillation and near the flexural stress 105 times is reduced to acceptable level according to making.
In certain embodiments, the crooked limited part of Wai Bu bell-mount or other form can be connected at point/regional 105F place by the pipeline section of buoyance lift and grappling.Can limit by the geometrical construction of the crooked limited part of bell-mount or other form in the bending of this position pipe.
In certain embodiments, can be made by titanium straight tube or titanium conical pipe by the pipeline section of buoyance lift and grappling at point/regional 105F place.The low bending stiffness of titanium material allows to have bigger bending curvature in this location.
In certain embodiments, in the zone of buoyance lift and anchor point 105F, can use short flexible hose.By this flexible hose, can allow bigger bending curvature.
In certain embodiments, can use deep-water flexible joint at buoyance lift and anchor point/regional 105F place.On the 105F and under the intersection of two catenary constructions become with deep-water flexible joint angled.
Though the present invention can be used for installing new riser member, also be useful for the method for improving existing underwater structures 105.For example, for existing floating main frame 103 (as shown in Figure 1) with the underwater structures 105 that extends to the bottom 120, improving one's methods comprises the part that promotes underwater structures 105 so that at the bottom of its leaving water 120, thereby forms recessed area 105F and fovea superior zone 105E (see figure 2).
Example
Carried out the computer simulation of one embodiment of the present of invention as shown in Figure 6.
Fig. 7 shows the fatigue results of prior art systems shown in Figure 1, consequently corresponds respectively to " DOE-B " and " API-X " of 26.5 and 2.7 years.
Fig. 8 shows the fatigue results of the system of one embodiment of the invention shown in Figure 6, and its result corresponds respectively to " DOE-B " and " API-X " of 3470 and 214 years.Compare with prior art systems shown in Figure 1, increased by 130 times and 79 times its fatigue life respectively.
Though exemplary embodiment of the present invention has been carried out specific description, but it should be understood that, can carry out various other to it improve under prerequisite without departing from the spirit and scope of the present invention, this it will be apparent to those skilled in the art that and can make easily.Therefore, example that the scope of claims should not be limited to here provide and explanation, but claim should be interpreted as comprising all features that are present in the novelty with patentability among the present invention, comprises that one of ordinary skill in the art of the present invention think all features that are equal to.
Claims (16)
1, a kind of floating system that has in the water-bed water body that is positioned at, this system comprises:
Swim in the host part in the water;
Elongated underwater line structure comprises:
Be connected to the top of main frame;
Extend to the seabed and be suitable for being connected to the bottom that rests the flow line on the seabed;
The first of presenting concave shape of line construction;
The second portion of presenting concave shape of line construction; And
The changeover portion that is concave shape, described changeover portion is between first and second portion.
2, floating system as claimed in claim 1, wherein said elongated underwater structures comprises steel catenary riser.
3, as one among the claim 1-2 or multinomial described floating system, also comprise the buoyancy member that is connected to changeover portion.
4, as one among the claim 1-3 or multinomial described floating system, also comprise the anchoring members that is connected to changeover portion.
5,, also comprise by a plurality of connectors being connected to buoyancy member in changeover portion, first and the second portion at least one as one among the claim 1-4 or multinomial described floating system.
6,, also comprise by a plurality of connectors being connected to a plurality of buoyancy members in changeover portion, first and the second portion at least one as one among the claim 1-5 or multinomial described floating system.
7,, also comprise by a plurality of connectors being connected to anchoring members in changeover portion, first and the second portion at least one as one among the claim 1-6 or multinomial described floating system.
8,, also comprise by a plurality of connectors being connected to a plurality of anchoring members in changeover portion, first and the second portion at least one as one among the claim 1-7 or multinomial described floating system.
9,, also comprise the buoyancy member of installing around changeover portion as one among the claim 1-8 or multinomial described floating system.
10, as one among the claim 1-9 or multinomial described floating system, the minimum point of wherein said first is hanged down 5 to 50 meters than the peak of changeover portion.
11, as one among the claim 1-10 or multinomial described floating system, wherein said changeover portion comprises at least one in prebuckling stay pipe, bell-mount, crooked limited part, tapered stress joints, titanium stress joint, flexible hose and the deep-water flexible joint.
12, a kind of method of improving floating system, this system comprises: swim in the main frame that has in the water-bed water body; Elongated underwater structures, this underwater structures has first end, the second end, and is positioned at the main body between this first end and the second end, wherein first end is connected to main frame, main body extends through water body, and the second end is positioned near the bottom, and this method comprises:
Changeover portion in hoist point lifting main body so that be enough to make the changeover portion of main body form concave shape at first depth of water place, makes the part of main body form concave shape at second depth of water place, and wherein second depth of water is darker than first depth of water.
13, method as claimed in claim 12 comprises that also the changeover portion with main body anchors to the bottom.
14,, wherein promote changeover portion and comprise changeover portion from 10 to 100 meters of bottom liftings as one among the claim 12-13 or multinomial described method.
15, as one among the claim 12-14 or multinomial described method, wherein said elongated underwater structures comprises steel catenary riser.
16, as one among the claim 12-15 or multinomial described method, dark 5 to 50 meters of wherein said second depth of waters than first depth of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310711190.3A CN103661819B (en) | 2006-09-21 | 2007-09-19 | Floating system connected to an underwater line structure and methods of use |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US82650606P | 2006-09-21 | 2006-09-21 | |
| US60/826,506 | 2006-09-21 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310711190.3A Division CN103661819B (en) | 2006-09-21 | 2007-09-19 | Floating system connected to an underwater line structure and methods of use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101517165A true CN101517165A (en) | 2009-08-26 |
Family
ID=39201232
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800350662A Pending CN101517165A (en) | 2006-09-21 | 2007-09-19 | Floating system connected to an underwater line structure and methods of use |
| CN201310711190.3A Expired - Fee Related CN103661819B (en) | 2006-09-21 | 2007-09-19 | Floating system connected to an underwater line structure and methods of use |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310711190.3A Expired - Fee Related CN103661819B (en) | 2006-09-21 | 2007-09-19 | Floating system connected to an underwater line structure and methods of use |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US8562256B2 (en) |
| CN (2) | CN101517165A (en) |
| AU (1) | AU2007299791B2 (en) |
| BR (1) | BRPI0716924A2 (en) |
| GB (1) | GB2454396B (en) |
| MY (1) | MY162261A (en) |
| NO (1) | NO20091337L (en) |
| WO (1) | WO2008036728A2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103261566A (en) * | 2010-11-09 | 2013-08-21 | 韦尔斯特里姆国际有限公司 | Riser assembly and method |
| CN103958818A (en) * | 2011-11-29 | 2014-07-30 | 韦尔斯特里姆国际有限公司 | Buoyancy compensating element and method |
| CN113153233A (en) * | 2021-03-26 | 2021-07-23 | 海洋石油工程股份有限公司 | Three-dimensional overlong rigid connection pipeline system with buoyancy device |
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| FR2932839B1 (en) * | 2008-06-23 | 2010-08-20 | Technip France | UNDERWATER TRANSPORTATION FACILITY FOR HYDROCARBONS. |
| AU2010213925B2 (en) | 2009-02-10 | 2013-02-14 | Shell Internationale Research Maatschappij B.V. | Free standing steel catenary risers |
| EP2253796A1 (en) * | 2009-05-20 | 2010-11-24 | Shell Internationale Research Maatschappij B.V. | Method of protecting a flexible riser and an apparatus therefor |
| WO2012143671A2 (en) | 2011-04-18 | 2012-10-26 | Magma Global Limited | Subsea conduit system |
| AU2012328225A1 (en) * | 2011-10-27 | 2014-05-01 | Ge Oil & Gas Uk Limited | Riser assembly and method of providing riser assembly |
| US9353579B2 (en) * | 2011-11-29 | 2016-05-31 | Ge Oil & Gas Uk Limited | Buoyancy compensating element and method |
| DK2994376T3 (en) | 2013-05-06 | 2018-10-22 | Single Buoy Moorings | Separate deep water turntable system with rigid lazy-wave riser configuration |
| US9708864B2 (en) * | 2014-12-22 | 2017-07-18 | Ge Oil & Gas Uk Limited | Riser assembly and method of forming a riser assembly |
| NO341536B1 (en) * | 2016-02-23 | 2017-12-04 | Can Systems As | A marine riser and method for installation |
| GB2593494B (en) * | 2020-03-24 | 2022-09-07 | Subsea 7 Do Brasil Servicos Ltda | Subsea Risers |
| US20220356766A1 (en) * | 2021-05-07 | 2022-11-10 | Mitchell Z. Dziekonski | Vibration damping subsea tubular system |
| GB2619950B (en) | 2022-06-22 | 2024-10-23 | Subsea 7 Do Brasil Servicos Ltda | Improving fatigue resistance of steel catenary risers |
| GB2619951A (en) | 2022-06-22 | 2023-12-27 | Subsea 7 Do Brasil Servicos Ltda | Improving fatigue resistance of steel catenary risers |
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| US4065822A (en) * | 1976-02-27 | 1978-01-03 | Texaco Inc. | Single point mooring with strain relief anchoring |
| US5615977A (en) * | 1993-09-07 | 1997-04-01 | Continental Emsco Company | Flexible/rigid riser system |
| FR2790814B1 (en) | 1999-03-09 | 2001-04-20 | Coflexip | HYBRID CONDUIT FOR LARGE DEPTH |
| GB2380747B (en) | 2001-10-10 | 2005-12-21 | Rockwater Ltd | A riser and method of installing same |
| US20080089745A1 (en) * | 2004-07-12 | 2008-04-17 | Peter Salome | Method And Device For Connecting A Riser To A Target Structure |
| US20090133612A1 (en) * | 2005-01-03 | 2009-05-28 | Krzysztof Jan Wajnikonis | Dynamic motion suppression of riser, umbilical and jumper lines |
| FR2889557B1 (en) * | 2005-08-04 | 2008-02-15 | Technip France Sa | UNDERWATER EQUIPPED WITH FLEXIBLE CONTROLLED CURVED DRIVING |
| US20070081862A1 (en) * | 2005-10-07 | 2007-04-12 | Heerema Marine Contractors Nederland B.V. | Pipeline assembly comprising an anchoring device and method for installing a pipeline assembly comprising an anchoring device |
-
2007
- 2007-09-19 WO PCT/US2007/078876 patent/WO2008036728A2/en active Application Filing
- 2007-09-19 MY MYPI20090746A patent/MY162261A/en unknown
- 2007-09-19 CN CNA2007800350662A patent/CN101517165A/en active Pending
- 2007-09-19 AU AU2007299791A patent/AU2007299791B2/en not_active Ceased
- 2007-09-19 US US12/441,979 patent/US8562256B2/en active Active
- 2007-09-19 BR BRPI0716924-8A patent/BRPI0716924A2/en not_active Application Discontinuation
- 2007-09-19 GB GB0902196.5A patent/GB2454396B/en not_active Expired - Fee Related
- 2007-09-19 CN CN201310711190.3A patent/CN103661819B/en not_active Expired - Fee Related
-
2009
- 2009-03-31 NO NO20091337A patent/NO20091337L/en not_active Application Discontinuation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103261566A (en) * | 2010-11-09 | 2013-08-21 | 韦尔斯特里姆国际有限公司 | Riser assembly and method |
| US9074427B2 (en) | 2010-11-09 | 2015-07-07 | Ge Oil & Gas Uk Limited | Riser assembly and method |
| CN103958818A (en) * | 2011-11-29 | 2014-07-30 | 韦尔斯特里姆国际有限公司 | Buoyancy compensating element and method |
| US9151121B2 (en) | 2011-11-29 | 2015-10-06 | Ge Oil & Gas Uk Limited | Buoyancy compensating element and method |
| CN103958818B (en) * | 2011-11-29 | 2017-05-10 | 通用电气石油和天然气英国有限公司 | Buoyancy compensating assembly and method |
| CN113153233A (en) * | 2021-03-26 | 2021-07-23 | 海洋石油工程股份有限公司 | Three-dimensional overlong rigid connection pipeline system with buoyancy device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008036728A3 (en) | 2008-11-13 |
| GB0902196D0 (en) | 2009-03-25 |
| MY162261A (en) | 2017-05-31 |
| US20090269141A1 (en) | 2009-10-29 |
| US8562256B2 (en) | 2013-10-22 |
| BRPI0716924A2 (en) | 2013-11-12 |
| AU2007299791B2 (en) | 2011-03-31 |
| CN103661819B (en) | 2017-05-10 |
| WO2008036728A2 (en) | 2008-03-27 |
| CN103661819A (en) | 2014-03-26 |
| GB2454396A (en) | 2009-05-06 |
| GB2454396B (en) | 2012-04-11 |
| NO20091337L (en) | 2009-06-11 |
| AU2007299791A1 (en) | 2008-03-27 |
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Application publication date: 20090826 |